Pyatte mine

Mica Mine in Avery county, North Carolina

Pyatte mine

Principal periods worked 1915, WWII
Workings 3 shafts, 80 deep, drifts 200, stopes(?)
Description of muscovite Green, stained, small
Shape Lenses
Size 6 T
Strike NW
Dip SW
Relation to wallrock Concordant(?)
Wallrock Biotite gneiss
Extent of weathering Weathered (50 ft).
Remarks F-Q-M pegmatite. Lenses pinched out in deep workings.
Source of information USGS, CMC

Geographic context


Principal periods worked
WWI World War I
WWII World War II
int intermittent
Small < 500 lb
Moderate 500-10,000 lb
Large > 10,000 lb
Size of pegmatite
D depth
L length
T thickness
avg average
Internal structure
B biotite
F feldspar
M muscovite
P perthite
Pl plagioclase
Q quartz
Source information
CMC Colonial Mica Corporation
DMEA Defense Minerals Exploration Administration
OME Office of Minerals Exploration
USGS U.S. Geological Survey
OF USGS open-file reports and maps